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PENSION AND OTHER POSTRETIREMENT BENEFITS (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Schedule of net benefit costs recognized |
| Three months ended September 30, |  | Nine months ended September 30,
| 2018 |  | 2017 |  |  | 2018 |  | 2017 |
(millions of Canadian dollars) |  |  |  |  |
Service cost | 46 |  | 65 |  |  | 162 |  | 181 |
Interest cost | 39 |  | 46 |  |  | 126 |  | 125 |
Expected return on plan assets | (72 | ) | (71 | ) |  | (234 | ) | (195 | )
Amortization of actuarial loss | 6 |  | 11 |  |  | 21 |  | 28 |
Plan curtailments | — |  | — |  |  | 2 |  | — |
Amortization of prior service costs | — |  | (1 | ) |  | (1 | ) | (1 | )
Net periodic benefit costs | 19 |  | 50 |  |  | 76 |  | 138 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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